Adding string type

app.py

@@ -20,7 +20,13 @@ def format_leaderboard_table(df_results: pd.DataFrame, assay: str | None = None)
     if assay is not None:
         df = df[df["assay"] == assay]
     df = df[LEADERBOARD_DISPLAY_COLUMNS]
-    return df.sort_values(by="spearman", ascending=False)
+    df = df.sort_values(by="spearman", ascending=False)
+    # After sorting, just add the reason for excluding heldout test set
+    # Note: We can also just say the following as a text box at the bottom of the leaderboard: "Note: Results for the Heldout Test Set are only evaluated at competition close"
+    # Convert spearman column to string to avoid dtype incompatibility when assigning text
+    df["spearman"] = df["spearman"].astype(str)
+    df.loc[(df["dataset"] == "Heldout Test Set") & (df["spearman"] == "nan"), "spearman"] = "N/A, evaluated at competition close"
+    return df
 
 
 def get_leaderboard_object(assay: str | None = None):